How do I install macOS on my old iMac?

I was given an old IMac late 2006. I am trying to use for fun but I can't install OS-X on it because it looks like someone tried to use it with Windows and the HD wont load windows and it won't let me install Lion or any software. Can someone give me some direction? I don't want to spend any money.


Thanks


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iPhone 6s Plus, iOS 15

Posted on May 16, 2025 03:09 PM

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May 16, 2025 04:19 PM in response to StephenJMOE

According to MacTracker, all of the Late 2006 iMacs shipped with Mac OS X 10.4.7 or 10.4.8 (Tiger). There never were any retail Tiger discs for Intel-based Macs; the only Tiger DVD-ROMs are the recovery discs Apple shipped with these early Intel-based Macs.


None of the Late 2006 iMacs can run anything than Mac OS X 10.7.5 (Lion). Lion dropped support for Rosetta 1. You can run some Mac OS X / PowerPC applications on Intel-based Macs under Snow Leopard, using Rosetta 1 - but as of Lion, any application that is PowerPC-only simply won't run.


Lion is so old that you're unlikely to be able do much Web browsing with it, whether with Safari or with third-party browsers. It predates the move to stronger protocols for https security, so the available browsers probably won't even be able to connect to many Web sites. There have also been many changes to how Web sites display things, so even if you manage to connect to a few sites, you may not be able to display their contents properly.


We're also talking about iMacs with

  • Two-core Core 2 Duo processors
  • A maximum of 2 GB or 3 GB of RAM (depending on the model)
  • Mechanical hard drives
  • USB 2.0 ports


By now, many of the games that ran on those old Macs will have been pulled from the market. Those iMacs date from before the introduction of the Mac App Store, when most software developers shipped programs on optical discs. The Mac App Store has now almost completely killed off that method of distribution, and it looks like some older 32-bit games either never made it to the App Store, or have been pulled from the App Store.

May 16, 2025 04:29 PM in response to StephenJMOE

To add a bit to den.thed's reply ...


... You will want to get a copy of the Snow Leopard 10.6 Retail DVD (avoid the gray machine-specific discs.) You can try both eBay and Amazon to see if copies still exist.


Search for “Mac OS X 10.6 Retail DVD” If they do, don't expect to get it for free as they typically go for around $15 - $30, although unopened new copies can go for significantly higher ... so not wanting to spend any money is not going to work for you.

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How do I install macOS on my old iMac?

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